51333645 has 24 divisors (see below), whose sum is σ = 90282528. Its totient is φ = 24888160.

The previous prime is 51333643. The next prime is 51333679. The reversal of 51333645 is 54633315.

It is a happy number.

It is not a de Polignac number, because 51333645 - 2¹ = 51333643 is a prime.

It is a super-3 number, since 3×51333645³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51333643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12327 + ... + 15956.

It is an arithmetic number, because the mean of its divisors is an integer number (3761772).

Almost surely, 2^51333645 is an apocalyptic number.

51333645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51333645 is a deficient number, since it is larger than the sum of its proper divisors (38948883).

51333645 is a wasteful number, since it uses less digits than its factorization.

51333645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28313 (or 28302 counting only the distinct ones).

The product of its digits is 16200, while the sum is 30.

The square root of 51333645 is about 7164.7501701036. The cubic root of 51333645 is about 371.6499119940.

It can be divided in two parts, 5133 and 3645, that added together give a palindrome (8778).

The spelling of 51333645 in words is "fifty-one million, three hundred thirty-three thousand, six hundred forty-five".